When a student transfered HCL to a graduated cylinder for addition to the sample , several drops ran down the outside of the cylinder and on to the laboratory bench . Explan the potential danger of this situation , and suggest a good way to clean up the spill.

The percent chloride in an unknown sample may be determined in a manner similar to that used for the determination of the percent sulfate. Suppose that a 0.6123-g uknown choloride - contaning smaple was dissolved , and AgCL precipated by adding AgNO3 solution. The precipitate was filtered , ignitied , and found to weight 0.3324 g. What was the percent chloride in the unknown.

A student , following the insstructions for this experiment , precipated and disgested BaSO4. After allowing the precipitate to settle, she added a few drops of BaCl2 solution , and the previously clear solution became cloudy. Explan what happened?

Explain why AgNO3 solution is used to test the rinse water after the BaSO4 precipate has been transferred to the filter paper.